Where: 'Inherent Vice' premiere during the 52nd New York Film Festival

Who: Emma Roberts

Wore: Saint Laurent Paris

Where: 'American Horror Story: Freak Show' premiere

Who: Sarah Paulson

Wore: Zac Posen

Where: 'American Horror Story: Freak Show' premiere

Who: Marion Cotillard

Wore: Christian Dior

Where: 'Two Days, One Night' premiere party

Who: Sienna Miller (with Tom Sturridge)

Wore: Roksanda Ilincic

Where: 'Effie Gray' premiere

Who: Teresa Palmer

Wore: Carolina Herrera

Where: Busan International Film Festival in Busan, South Korea

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Earlier this season it was the crop top, but right now, the plunging necklines is the look all the celebrities seem to be going for. Lea Michele sported a bold look at the 'American Horror Story: Freak Show' premiere in Los Angeles this weekend, opting for a seriously low-cut blue velvet Cushnie et Ochs dress. Hilary Swank, Emmy Rossum, and even Dakota Fanning hopped on board with similarly deep-cut necklines throughout the weekend. Who said Kim Kardashian isn't a trendsetter?

We're still seeing lots of black and autumnal hues to start off fall, but this weekend, we also noticed richer fabrics like velvet and suede on the red carpet. Florals are still sticking around, but they're feeling darker and moodier. It looks like fall has officially arrived!

Click through the gallery to see all the best celebrity looks from the weekend.